# include <stdio.h>

void removeDuplicates(int arr[], int*size){
    if(*size <= 0) return;
    
    int writeIndex = 1;
    for(int readIndex = 1; readIndex <*size; readIndex++){
        int isDuplicate = 0;
        for(int i = 0; i < writeIndex; i++){
            if(arr[readIndex] == arr[i]){
                isDuplicate = 1;
                break;
            }
        }
        if (!isDuplicate){
            arr[writeIndex] = arr[readIndex];
            writeIndex++;
        }
        
    }
    *size = writeIndex;
}

int main() {
    int n;
    scanf("%d", &arr[i]);
    
    if (n < 0){
        printf("Invalid input\n");
        return 0;
    }
    
    int arr[n];
    for(int i= 0; i < n; i++){
        scanf("%d", &arr[i]);
    }
    removeDuplicate(arr, &n);
    for(int i = 0; i < n; i++){
        printf("%d", arr[i]);
        
    }
    printf("\n");
    return 0;
}